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InterviewSolution
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Lemon juice normally has a `pH` of `2`. If all the acid the lemon juice is citric acid and there are no citrate salts present, then what will be the citric acid concentration `[Hcit]` in the lemon juice? (Assume that only the first hydrogen of citric acid is important) `HCithArrH^(+)+Cit^(-)`, `K_(a)=8.4xx10^(-4) mol L^(-1)`A. `8.4xx10^(-4) M`B. `4.2xx10^(-4) M`C. `16.8xx10^(-4) M`D. `11.9xx10^(-2) M` |
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Answer» Correct Answer - D `[H^(+)]=sqrt(K_(a)C), pH=2, :. [H^(+)]=10^(-2) M` `10^(-2)=sqrt(K_(a)C)` `10^(-4)=8.4xx10^(-4)xxC` `:. C=11.9xx10^(-2) M` |
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